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authorDongsheng Yang <yangds.fnst@cn.fujitsu.com>2015-11-07 12:46:11 +0800
committerRichard Weinberger <richard@nod.at>2015-11-07 11:35:08 +0100
commit8c1c5f263833ec2dc8fd716cf4281265c485d7ad (patch)
treeeb2192812a04954d607b587bd563afe8812103c5 /fs/ubifs/Kconfig
parentab92a20bce3b4c21927cc1ae514c482f50ad3487 (diff)
downloadlinux-8c1c5f263833ec2dc8fd716cf4281265c485d7ad.tar.bz2
ubifs: introduce UBIFS_ATIME_SUPPORT to ubifs
To make ubifs support atime flexily, this commit introduces a Kconfig option named as UBIFS_ATIME_SUPPORT. With UBIFS_ATIME_SUPPORT=n: ubifs keeps the full compatibility to no_atime from the start of ubifs. =================UBIFS_ATIME_SUPPORT=n======================= -o - no atime -o atime - no atime -o noatime - no atime -o relatime - no atime -o strictatime - no atime -o lazyatime - no atime With UBIFS_ATIME_SUPPORT=y: ubifs supports the atime same with other main stream file systems. =================UBIFS_ATIME_SUPPORT=y======================= -o - default behavior (relatime currently) -o atime - atime support -o noatime - no atime support -o relatime - relative atime support -o strictatime - strict atime support -o lazyatime - lazy atime support Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com> Reviewed-by: Richard Weinberger <richard@nod.at> Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'fs/ubifs/Kconfig')
-rw-r--r--fs/ubifs/Kconfig15
1 files changed, 15 insertions, 0 deletions
diff --git a/fs/ubifs/Kconfig b/fs/ubifs/Kconfig
index ba66d508006a..7ff7712f284e 100644
--- a/fs/ubifs/Kconfig
+++ b/fs/ubifs/Kconfig
@@ -35,3 +35,18 @@ config UBIFS_FS_ZLIB
default y
help
Zlib compresses better than LZO but it is slower. Say 'Y' if unsure.
+
+config UBIFS_ATIME_SUPPORT
+ bool "Access time support" if UBIFS_FS
+ depends on UBIFS_FS
+ default n
+ help
+ Originally UBIFS did not support atime, because it looked like a bad idea due
+ increased flash wear. This option adds atime support and it is disabled by default
+ to preserve the old behavior. If you enable this option, UBIFS starts updating atime,
+ which means that file-system read operations will cause writes (inode atime
+ updates). This may affect file-system performance and increase flash device wear,
+ so be careful. How often atime is updated depends on the selected strategy:
+ strictatime is the "heavy", relatime is "lighter", etc.
+
+ If unsure, say 'N'